1 // RUN: %clang_cc1 -std=c++11 -verify %s
2
3 template<typename T> struct A {
4 enum E : T; // expected-note {{here}}
5 E v;
fA6 E f() { return A::e1; } // expected-error {{no member named 'e1' in 'A<T>'}}
gA7 E g() { return E::e1; }
8 E h();
9 };
10
11 A<int> a;
12 A<int>::E a0 = A<int>().v;
13 int n = A<int>::E::e1; // expected-error {{implicit instantiation of undefined member}}
14
15 template<typename T> enum A<T>::E : T { e1, e2 }; // expected-note 2 {{declared here}}
16
17 // FIXME: Now that A<T>::E is defined, we are supposed to inject its enumerators
18 // into the already-instantiated class A<T>. This seems like a really bad idea,
19 // though, so we don't implement that, but what we do implement is inconsistent.
20 //
21 // Either do as the standard says, or only include enumerators lexically defined
22 // within the class in its scope.
23 A<int>::E a1 = A<int>::e1; // expected-error {{no member named 'e1' in 'A<int>'; did you mean simply 'e1'?}}
24
25 A<char>::E a2 = A<char>::e2;
26
h()27 template<typename T> typename A<T>::E A<T>::h() { return e2; }
28 A<short>::E a3 = A<short>().h();
29
30
31 template<typename T> struct B {
32 enum class E;
33 E v;
fB34 E f() { return E::e1; }
35 E g();
36 };
37
38 B<int> b;
39 B<int>::E b0 = B<int>().v;
40
41 template<typename T> enum class B<T>::E { e1, e2 };
42 B<int>::E b1 = B<int>::E::e1;
43
44 B<char>::E b2 = B<char>::E::e2;
45
g()46 template<typename T> typename B<T>::E B<T>::g() { return e2; }
47 B<short>::E b3 = B<short>().g();
48
49
50 // Enumeration members of class templates can be explicitly specialized. For
51 // unscoped enumerations, specializations must be defined before the primary
52 // template is, since otherwise the primary template will be implicitly
53 // instantiated when we parse the nested name specifier.
54 template<> enum A<long long>::E : long long { e3, e4 }; // expected-error {{explicit specialization of 'E' after instantiation}} expected-note {{first required here}}
55
56 template<> enum class B<long long>::E { e3, e4 };
57 B<long long>::E b4 = B<long long>::E::e4;
58
59 B<long>::E b5;
60 template<> enum class B<long>::E { e5 };
fb5()61 void fb5() { b5 = decltype(b5)::e5; }
62 B<long>::E b6 = B<long>::E::e5;
63
64
65 template<typename T> struct C {
66 enum class E : T;
67 };
68
69 template<> enum class C<long long>::E : long long { e3, e4 };
70 C<long long>::E c0 = C<long long>::E::e3;
71
72 C<long>::E c1;
73 template<> enum class C<long>::E : long { e5 };
fc1()74 void fc1() { c1 = decltype(c1)::e5; }
75 C<long>::E c2 = C<long>::E::e5;
76
77 template<> enum class C<int>::E : int { e6 };
78 template<typename T> enum class C<T>::E : T { e0 };
79 C<int>::E c3 = C<int>::E::e6;
80 C<int>::E c4 = C<int>::E::e0; // expected-error {{no member named 'e0' in 'C<int>::E'}}
81
82
83 // Enumeration members can't be partially-specialized.
84 template<typename T> enum class B<T*>::E { e5, e6 }; // expected-error {{nested name specifier for a declaration cannot depend on a template parameter}}
85
86
87 // Explicit specializations can be forward-declared.
88 template<typename T>
89 struct D {
90 enum class E { e1 };
91 };
92 template<> enum class D<int>::E;
93 D<int>::E d1 = D<int>::E::e1; // expected-error {{incomplete type 'D<int>::E'}}
94 template<> enum class D<int>::E { e2 };
95 D<int>::E d2 = D<int>::E::e2;
96 D<char>::E d3 = D<char>::E::e1; // expected-note {{first required here}}
97 D<char>::E d4 = D<char>::E::e2; // expected-error {{no member named 'e2' in 'D<char>::E'; did you mean simply 'e2'?}}
98 template<> enum class D<char>::E { e3 }; // expected-error {{explicit specialization of 'E' after instantiation}}
99
100 template<> enum class D<short>::E;
101 struct F {
102 // Per C++11 [class.friend]p3, these friend declarations have no effect.
103 // Only classes and functions can be friends.
104 template<typename T> friend enum D<T>::E;
105 template<> friend enum D<short>::E;
106
107 template<> friend enum D<double>::E { e3 }; // expected-error {{cannot define a type in a friend declaration}}
108
109 private:
110 static const int n = 1; // expected-note {{private here}}
111 };
112 template<> enum class D<short>::E {
113 e = F::n // expected-error {{private member}}
114 };
115
116 class Access {
117 friend class X;
118
119 template<typename T>
120 class Priv {
121 friend class X;
122
123 enum class E : T;
124 };
125
126 class S {
127 typedef int N; // expected-note {{here}}
128 static const int k = 3; // expected-note {{here}}
129
130 friend class Priv<char>;
131 };
132
133 static const int k = 5;
134 };
135
136 template<> enum class Access::Priv<Access::S::N>::E
137 : Access::S::N { // expected-error {{private member}}
138 a = Access::k, // ok
139 b = Access::S::k // expected-error {{private member}}
140 };
141
142 template<typename T> enum class Access::Priv<T>::E : T {
143 c = Access::k,
144 d = Access::S::k
145 };
146
147 class X {
148 Access::Priv<int>::E a = Access::Priv<int>::E::a;
149 Access::Priv<char>::E c = Access::Priv<char>::E::d;
150 // FIXME: We should see an access error for this enumerator.
151 Access::Priv<short>::E b = Access::Priv<short>::E::d;
152 };
153